Con que frecuencia vas a la biblioteca

In spanish, it is grammatically correct to have more than one negative in a sentence.

Which word or phrase best completes this conversation? eric: qué bueno que vinimos al lago, ahora podemos bañarnos. roberto: ¡oh, no! me he olvidado de traer mi a. chaqueta b. traje de baño c. saco de dormir d. sandalias

Besides the "dia de los muertos", what are the events that commemorate the dead in some spanish speaking countries